The IFR Clearance option will disappear a few minutes after takeoff

The IFR Clearance option will disappear a few minutes after takeoff. I request takeoff vfr and in flight I want to request ifr but the option disappears from ATC. I tried changing the flight plan and switching the CDI. Nothing helps.

6 posts were merged into an existing topic: Why does the IFR Clearance option disappear when crossing from one ARTCC into another ARTCC after handoff?